滤波技术在有杆泵抽油系统诊断中的应用

已被广泛采用的有杆泵抽油系统井下工况诊断技术依据光杆位移随时间的变化和光杆负荷随时间的变化规律，通过力学分析，从而了解整个抽油系统的运行状况。但是在测量光杆位移时，测量仪器的转速异常会使光杆位移的测量值与实际值有较大的偏差，光杆示功图出现一定程度的失真，且导致计算出的抽油泵示功图严重变形, 无法得到准确诊断结果。为此提出了一种对测量的光杆位移函数先进行滤波处理的有杆泵抽油系统诊断技术。该诊断技术可以对光杆位移数据进行滤波，优化光杆示功图，减少误差，计算出较准确的抽油泵示功图。在某油田多口抽油井上的应用证明了该技术具有可靠性和实用性。

Application of filter technique to diagnosis of sucker-rod pumping system

The down hole sucker-rod pumping system diagnosis technology widely used in oil fields is based on the relationship of polished rod displacement with time and the relationship of polished rod load with time to determine the running conditions of the whole system. In the survey of rod displacement, the abnormity rotation of dynamometer will cause some errors between the measured value and the true value of the polished rod,which further result in some deformation of polished rod dynamometer diagram and serve deformation of computed pump dynamometer diagram. A new sucker-rod pumping diagnosis technology was proposed on the basis of filtering treatment of measured displacement of polished rod. This diagnosis technology can filtrate displacement data and optimize the polished dynamometer diagram to reduce some errors and accurately compute pump dynamometer diagram. The new technology was verified to be credible and practical with the on-site data.